// created by gpake
(function() {

  var config = {
      qiniuRegion: '',
      qiniuImageURLPrefix: '',
      qiniuUploadToken: '',
      qiniuUploadTokenURL: '',
      qiniuUploadTokenFunction: null,
      qiniuShouldUseQiniuFileName: false
  }
  
  module.exports = {
      init: init,
      upload: upload,
  }
  wx.mew.qiniu = upload;
  
  // 在整个程序生命周期中，只需要 init 一次即可
  // 如果需要变更参数，再调用 init 即可
  function init(options) {
      config = {
          qiniuRegion: '',
          qiniuImageURLPrefix: '',
          qiniuUploadToken: '',
          qiniuUploadTokenURL: '',
          qiniuUploadTokenFunction: null,
          qiniuShouldUseQiniuFileName: false
      };
      updateConfigWithOptions(options);
  }
  
  function updateConfigWithOptions(options) {
      if (options.region) {
          config.qiniuRegion = options.region;
      } else {
          console.error('qiniu uploader need your bucket region');
      }
      if (options.uptoken) {
          config.qiniuUploadToken = options.uptoken;
      } else if (options.uptokenURL) {
          config.qiniuUploadTokenURL = options.uptokenURL;
      } else if(options.uptokenFunc) {
          config.qiniuUploadTokenFunction = options.uptokenFunc;
      }
      if (options.domain) {
          config.qiniuImageURLPrefix = options.domain;
      }
      config.qiniuShouldUseQiniuFileName = options.shouldUseQiniuFileName
  }
  
  function upload(filePath, success, fail, options, progress, cancelTask) {
      if (null == filePath) {
          console.error('qiniu uploader need filePath to upload');
          return;
      }
      if (options) {
        updateConfigWithOptions(options);
      }
      if (config.qiniuUploadToken) {
          doUpload(filePath, success, fail, options, progress, cancelTask);
      } else if (config.qiniuUploadTokenURL) {
          getQiniuToken(function() {
              doUpload(filePath, success, fail, options, progress, cancelTask);
          });
      } else if (config.qiniuUploadTokenFunction) {
          config.qiniuUploadToken = config.qiniuUploadTokenFunction();
          if (null == config.qiniuUploadToken && config.qiniuUploadToken.length > 0) {
              console.error('qiniu UploadTokenFunction result is null, please check the return value');
              return
          }
          doUpload(filePath, success, fail, options, progress, cancelTask);
      } else {
          console.error('qiniu uploader need one of [uptoken, uptokenURL, uptokenFunc]');
          return;
      }
  }
  
  function doUpload(filePath, success, fail, options, progress, cancelTask) {
      if (null == config.qiniuUploadToken && config.qiniuUploadToken.length > 0) {
          console.error('qiniu UploadToken is null, please check the init config or networking');
          return
      }
      var url = uploadURLFromRegionCode(config.qiniuRegion);
      var fileName = filePath.split('//')[1];
      if (options && options.key) {
          fileName = options.key;
      }
      var formData = {
          'token': config.qiniuUploadToken
      };
      if (!config.qiniuShouldUseQiniuFileName) {
        formData['key'] = fileName
      }
      var uploadTask = wx.uploadFile({
          url: url,
          filePath: filePath,
          name: 'file',
          formData: formData,
          success: function (res) {
            var dataString = res.data
            if(res.data.hasOwnProperty('type') && res.data.type === 'Buffer'){
              dataString = String.fromCharCode.apply(null, res.data.data)
            }
            try {
              var dataObject = JSON.parse(dataString);
              //do something
              var imageUrl = config.qiniuImageURLPrefix + '/' + dataObject.key;
              dataObject.imageURL = imageUrl;
              if (success) {
                success(dataObject);
              }
            } catch(e) {
              console.log('parse JSON failed, origin String is: ' + dataString)
              if (fail) {
                fail(e);
              }
            }
          },
          fail: function (error) {
              console.error(error);
              if (fail) {
                  fail(error);
              }
          }
      })
  
      uploadTask.onProgressUpdate((res) => {
          progress && progress(res)
      })
  
      cancelTask && cancelTask(() => {
          uploadTask.abort()
      })
  }
  
  function getQiniuToken(callback) {
    wx.request({
      url: config.qiniuUploadTokenURL,
      success: function (res) {
        var token = res.data.uptoken;
        if (token && token.length > 0) {
          config.qiniuUploadToken = token;
          if (callback) {
              callback();
          }
        } else {
          console.error('qiniuUploader cannot get your token, please check the uptokenURL or server')
        }
      },
      fail: function (error) {
        console.error('qiniu UploadToken is null, please check the init config or networking: ' + error);
      }
    })
  }
  
  function uploadURLFromRegionCode(code) {
      var uploadURL = null;
      switch(code) {
          case 'ECN': uploadURL = 'https://up.qbox.me'; break;
          case 'NCN': uploadURL = 'https://up-z1.qbox.me'; break;
          case 'SCN': uploadURL = 'https://up-z2.qbox.me'; break;
          case 'NA': uploadURL = 'https://up-na0.qbox.me'; break;
          case 'ASG': uploadURL = 'https://up-as0.qbox.me'; break;
          default: console.error('please make the region is with one of [ECN, SCN, NCN, NA, ASG]');
      }
      return uploadURL;
  }
  
  })();